<?php
/**
 * Created by PhpStorm.
 * User: User
 * Date: 2017/12/5
 * Time: 15:47
 */

namespace Test;
class Who
{
    public function aa()
    {
        echo 'aa';
        return $this;
    }

    public function bb()
    {
        echo 'bb';
        return $this;
    }

    public function cc()
    {
        echo 'cc';
        return $this;
    }


}